Dental pressure gauge



DENTAL PRESSURE GAUGE.

APPLICMION FILED AUG.27, |921.

Fi-l la WJLO ONO, OF LOS ANGELES, ALXEORNA.

nmzrrer. sauer..

Specification of Letters Patent.

rar-,eaten aug. ae, ieee.

Application filed .august 27, 1921. Serial rNo. 496,102.

kTo @ZZ who/m, t may concern:

Be it known that l', lwao ONO, a subject cic the Emperor of Japan, residing 'in the city and county of Los Angeles and State of California, have invented a new and useful Dental ljressure Gauge, of whichthe following is a specification.

This inventionhas relation to means for ascertaining trie pressure capableot being exerted by a person in the act of biting with the teeth and jaws, the invention embodying a device vwhich is useful for ascertaining the pressure exerted by gripping with the hand.

The object of this invention `isto produce a device by which the pressure exerted in the act oi' biting, is visually indicated by a i'luid pressure gauge, and to-pi'oducea deviceof thischaracter in which the pressure gauge is adjustable to the view romdiiofereiit angles and positions.

Other objects and advantages will hereinafter appear; and the invention consists in a pressure cylinder in'cominunication with a fluid pressure gauge, a plunger Working in the cylinder, and means adapted for operation by a bite ofthe teeth orl jaws for actunl ating the piston. l ln the drawings, Figure 1 is an end elevation of my improved device. Fig. 2 is a side elevation of the same. Fig. 3 is a top plan view of the base member. llig. 1 is a vertical and mid-sectional view of the device. Fig is a longitudinal sectional view et the ulcruin lever elements. plan view thereof. Fig. 7 is a bottom plan view of the pressure plunger. Fig. 8 is a detail side view ofthe central fulcruin lever element. Fig. 9 is a perspectivedetail view ofthe fulcrum bolt.

lReferring to the drawings,'my improved kbite-gauge consists of a base member 11,v

screwedvto cylinder-head 12, attached to cylinder casing 13. Handles 14 are attached yto and retain the top and Vbottom flange meinbers 15, on the casing; the handles serving topermit the device to be conveniently held by the dentist or operator. The casing has revolublymounted therein, an inner cylindrical membei 16, forming a pressure chain-y ber 17 in which is mounted plunger 18, pro vided with a gasket 19, retained thereon by bolt 2O and washer 21. Gasket 19 is adapted t0-prevent leakage ot the `oil lwliih it the upper endy ot the inner cylindrical member 16, l have provided a `fluid preslig. 6 is a topk .20,

sure gauge 22, in constant communication with chamber 17. rlhepressure gauge is not illustrated iny detail, asi therer are several pressure gauges now in use and on themarlret, and any iiuidpressure gauge may be used in combination with ber.

Casing 13 is provided with oppositeiy disposed apertures 23, in which are mounted the adjustable and transversely extending tulthe pressure chamf crum bars 211, and tiltable fulcruin member 25. Bars 24e are united `at one vend by web 26, and are providedjwith longitudinal slots 27. .L fulcrum bolt 28, extends transversely through slots 27, and throughslot 29, 'in ulcrum member '25. Fulcrum bolt 28 is provided. with a triangular part 30, adapted to engage with notches 81 in the upper side 01' slot 29.j A bearing member 32', mounted' on plunger 18, is in engagement with central fulcrum member 25. k,The ulerum bolt 28 is secured by a clamp-nutBB.

@the outer extremity `3/1, oftiltable member 25,'- and web .portion 26, of bars 24, have mounted thereon corrugated plates 35, which are `engaged by the yteeth when the biting capacity is to be tested. 'By providing bars 241, with graduated marks 36, the ulcruin bolt 28 may be readily set to' engage with any of the notches 31 intiltable member 25. The graduated marks indicate points for setting' bars 211 relative `to'casing 13, and thus additional adjustment `of the ulcrum bolt "o relative to the worlringplunger, is provided. f

,ln use, thel registering capacity of the device is increased `and decreased, `by setting `the 'tulcrum bolt near to or Laway from the ,point ofy contact of bearing member 32, on

- extremities of the 'ulcrum ybars 241` and til"- able fulcrum member 25, are placed in the Vmouth of the personfwliose bite is to be tested.y The relative degree of pressure is then kdisplayed byk the'pressure gauge, which may be turned at any angle to be conveniently y,

read by the dentist or operator. For registering or indicating the lowest pressure, the 'fulcrum bolt is set in its outermost position in slots `27 and 29, and the supporting bars 24e are shifted in apertures 23, so that the fulcrum arm or the tiltable member extending beneath the plunger, has its relatively shortest length, and the arm o't the tiltable member engaged by the teeth, has its relatively longest length. lf the pressure is then in excess oit the capacity'ot the gauge 22, the device may be further adjusted until the degree of pressure is registered by the gauge. For determining the pressure Which may be exerted by the grip oi' the hands, the Yfulcrum supporting bars and tiltable member shown, may be interchanged for longer ones.

. lWhile simple and efiicient means are herein provided ior accomplishing the objects et the invention, and the elements shown are well adapted to serve the purposes for which they are intended, it is to be understood that l do not limit myself to the precise construction shown in the drawings, but that the invention may be altered and varied in minor details Within the scope of the ap-y pended claims.

That is claimed is:

1. The combination vvith a standard, of a cylindrical body member supported by the standard, said body member having oppositely disposed apertures, an inner cylindrical casing revolubly mounted Within the body member, a plunger Working Within the casing, a iiuid pressure gauge mounted on the upper end of the revoluble casing., and in communication with the chamber formed by the plunger and inner casing, iulcrum bars extending transversely through tie body member and disposed in said apertures, a tiltable ulerum bar disposel between the first-named fulcrum bars, a bearing member associated with the plunger and engaging vvith the tiltable ulcrum member, and a :tulcrum bolt passing through said ulcrum bars, and adjustable relative thereto and relative to the bearing member on the plunger.

2. rEhe combination with a standard, of a cylindrical body member supported thereby, an inner casing concentric With the body member, a plunger Working in the inner casing and forming therewith a pressure chamber, a pressure gauge fixed to the inner casing and in communication vvith the pressure chamber, ulcrum bars extending through the body member and beneath the inner casing, one of said bars being tiltable relative to the remaining bars, a bearing member mounted on the plunger and engaging With the intermediate tiltable iiulcrum bar, and a detachable :tulerum bolt for' changing the ulcrum point or the intermediate fulcrum bar.

3. The combination with a standard, of a body member supported thereby, an inner casing concentric with the body member, al plunger Working in the inner casing, a fluid pressure gauge in communication with the pressure chamber formed by the inner casing and plunger, supporting ulcriun bars and bearing upon the tiltable ulcrum bar,

and a Yulcrum bolt extending through the tulcrum bars.

1l. 'l` he combination with a standard, ot a body member supported thereby, an inner casing rcvolubly mounted in and concentric With the body member, a piston Working therein, a liuid pressure gauge on the inner casing and in communication with the pressure chamber formed by the casingpiston, and means operated by engagement with the teeth for actuating` the piston.

5. The combination with a standard, of a body member supported thereby, a casing in the body member and enclosing a pressure chamber, a piston Working in the pressure chamber, and means mounted in the body member and adapted to be operated by the teethtor actuating the piston.

6. rlhe combination with standard, of a body member supported thereby, an inner casing r yolubly mounted in and concentric with the body member, a piston Working therein, a` fluid pressure gauge mounted on the inner casing and in communication With the pressure chamber formed by the inner casing` and plunger, ulcrum suppoting bars extending transversely through the body member and adjustable relative thereto, said supp rting bars having longitudinal slots therein, a. tiltable fulcrum bar mounted between the supporting ulcrum bars, a bearing member mounted in the plunger and engaging with the tiltable fulcrum bar, the said tiltable bar having` a longitudinal slot, and a iulcrumbolt eX- tcnding through said longitudinal slots and adjustable therein.

Z The combination with a standard, of a body member supported thereby, an inner casing mounted in the body mem ver, a fluid pressure gauge on the inner casing, a plunger working in the inner casing, supporting bars extending transversely through the body member and adjustable therein, a tilttable lever disposed between the supporting bars, and a movable 'l'ulcrum bolt extending through the supporting bars and tiltable lever.

S. rihe combination with a body member having oppositely disposed apertures and oppositely disposed handles, ot a concentric casing revolubly mounted therein, a pressure gauge lined to the ci sing, a plunger Working in 'the casing, lulcrum supporting bars in said apertures and extending beyond the Walls of the body member, saidsupporting bars having longitudinal slots therein,

a tiltable lever disposed` between said supporting bars and having a corresponding longitudinal slot, and notches in the upper edge of said slot, a fuleruin bolt extending through said slots and having a triangular section to engage with said notches in the tiltablelever, a clamp nut for the fulerum bolt, and indicating marks on the supporting bars for setting the fulcrum bolt.

9. rllhe Combination with a body member having oppositely disposed apertures and oppositely disposed handles, of a concentric casing revolubly mounted in the body member, a plunger Working in the casing and forming therewith a pressure chamber, a pressure gauge mounted on the revoluble casing and in communication with the pressure chamber, fulcrum supporting bars eX- tending transversely through the body inember and disposed in said apertures, said sup-y i, porting bars having longitudinal slots, a

lever and engaging with the notches in the p tiltable lever, marks on the supportingrnembers lto indicate the position for the ulcrum bolt, and other indicating marks intermediate the lirst named marks, Jfor setting the supporting bars relative to the body member, said tiltable lever being arranged to yactuate the Working plunger.

Au St, 1921.

Signed this 13th day of v t Il/ AO ONO. 

